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Pat. 10381867 United States, Int. Cl.22 H02J 9/00, H02J 9/06, H02M 7/44. Ferroresonant transformer systems and methods with selectable input and output voltages for use in uninterruptible power supplies : Appl. N 15/294571 : Filed 14.10.2016 : Pub. 13.08.2019 : / Thanh Quoc Le, Pankaj H. Bhatt, Thomas Patrick Newberry ; Assignee Alpha Technologies Services Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10381867/en?oq=US10381867.html (дата обращения: ДД.ММ.ГГГГ).